I would love to see something like "true salary" where people can enter the actual hours they work, vacation days they get and salary (+ taxation as an option). If I compare on a per hour basis and factor in vacation time quite a few good looking US salaries become a lot less attractive for say a French software developer who is working a 35h workweek. It's especially interesting if you compare "boring" development jobs to "highly innovative" ones because in boring jobs (in house J2EE etc.) you're often actually able to more or less stick to the 40h/week without much overtime.